Sökning: "oxygen abundance"
Visar resultat 1 - 5 av 25 uppsatser innehållade orden oxygen abundance.
1. Measuring copper abundances in the Galactic Bulge
Kandidat-uppsats, Lunds universitet/Astrofysik; Lunds universitet/Fysiska institutionenSammanfattning : Context: The chemical evolution of Cu in the Galactic bulge have been studied in a few studies using red giant branch stars, but the ages of individual red giant stars are difficult to determine. In addition, the bulge has been a challenging region of the Milky Way galaxy to obtain high-resolution spectra of stars, except when observing through certain few small fields into the bulge that are known to have low extinction. LÄS MER
2. Potassium in the Galactic Bulge - as traced by microlensed dwarf & sub-giant stars
Kandidat-uppsats, Lunds universitet/Astrofysik; Lunds universitet/Fysiska institutionenSammanfattning : During this report the potassium (K) trend in the Galactic Bulge, with respect to metallicity and various α-elements, has been computed and evaluated by a method of line synthesis on the 7698.96 ̊A KI line (7699 KI), where Non-Local-Thermal-Equilibrium (NLTE) effects have been considered. LÄS MER
3. Biodiversitet i naturliga kolsänkor : sammansättning av sedimentlevande djur samt kollagring i kustnära habitat
Kandidat-uppsats, Södertörns högskola/Institutionen för naturvetenskap, miljö och teknikSammanfattning : Havet har en nyckelroll när det kommer till de ökade koldioxidutsläppen som tär på miljön då den är en naturlig kolsänka. Kustnära habitat och vegeterade områden såsom sjögräsängar har visat sig vara mycket effektiva på att fånga upp organiskt kol som lagras i bottensedimenten. LÄS MER
4. As I live and breathe! : The effects of hypolimnic oxygenation on benthic macroinvertebrate and zooplankton assemblages
Master-uppsats, Umeå universitet/Institutionen för ekologi, miljö och geovetenskapSammanfattning : Exacerbated deep-water hypoxia, brought about by anthropogenic-derived dissolved organic carbon (DOC) input, has potentially detrimental impacts on organisms residing in freshwater ecosystems. Oxygenation of the water column is a potential management strategy to mitigate this impact, and used to alleviate DOC induced oxygen depletion. LÄS MER
5. Differences between solar atlases and implications on the solar oxygen abundance
Kandidat-uppsats, Uppsala universitet/Institutionen för fysik och astronomiSammanfattning : The determination of the solar oxygen abundance is a topic that has long beenunder debate, where the exact value has varied between researchers. These variationsin the oxygen abundance have implications on our understanding of the Sun and itsinterior as well as our understanding of other stars. LÄS MER